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Nasa B747 Shuttle Carrier  
User currently offlineCancidas From Poland, joined Jul 2003, 4112 posts, RR: 11
Posted (10 years 2 months 1 week 6 days 17 hours ago) and read 2544 times:

i was just wondering about this aircraft/ shuttle configuration. a few things i'm curious about is how is the center of gravity affected with respect to rolling the a/c? did the pilots not roll it completely to avoid strange overloading the wing? i'm not engineer but i doubt that the 747 was designed to fly with that thing strapped to it's back.



"...cannot the kingdom of salvation take me home."
7 replies: All unread, jump to last
 
User currently offlineVzlet From United States of America, joined Mar 2004, 839 posts, RR: 0
Reply 1, posted (10 years 2 months 1 week 6 days 15 hours ago) and read 2452 times:

Not sure what you mean by "roll it completely", but I assume you're not talking about aerobatics. I saw the combination fly at Paris and, while the 747 crew wasn't horsing their plane around the sky, they didn't seem to especially baby it either. They even did a touch-and-go.

-Mark



"That's so stupid! If they're so secret, why are they out where everyone can see them?" - my kid
User currently offlineDfwRevolution From United States of America, joined Jan 2010, 997 posts, RR: 51
Reply 2, posted (10 years 2 months 1 week 6 days 11 hours ago) and read 2372 times:

As I understand it, the shuttle wing provides a little lift of its own, so the structural loads on the aircraft are actually stronger when the SCA is parked. As for center of gravity, the shuttle is planted directly over the midportion of the fuselage and hell trim ballast could easily compensate for any other imballance.

did the pilots not roll it completely to avoid strange overloading the wing?

The shuttle (empty) weights about 150,000 lbs which is only slightly beyond the limits of a regular stock-built 747. With the modifications NASA has done, it can carry the shuttle safely and easily.


User currently offlineDl021 From United States of America, joined May 2004, 11447 posts, RR: 75
Reply 3, posted (10 years 2 months 1 week 6 days 11 hours ago) and read 2370 times:

The 747-123 in the web site below is an ex-American Airlines bird that NASA uses and it takes the load just fine, but I have never heard of somebody rolling the airframe. There are two Shuttle Carrier Aircraft and they can be seen on the following website.

http://www.dfrc.nasa.gov/Newsroom/FactSheets/FS-013-DFRC.html
This is NASA's web site on the SCA

http://groups.msn.com/SpaceCowboySaloon/nasaaircraft.msnw
This site has some good photos of the airplane in flight as well as some of the shuttle being loaded.

[Edited 2004-09-17 16:56:39]

[Edited 2004-09-17 17:00:03]


Is my Pan Am ticket to the moon still good?
User currently offlineSATL382G From , joined Dec 1969, posts, RR:
Reply 4, posted (10 years 2 months 1 week 6 days 9 hours ago) and read 2351 times:

Cancidas is talking about the "height" of the CG rather than its position fore and aft as we normally think of CG in a transport aircraft.

This increase in CG height means the roll axis is also displaced upwards.
Think top heavy boat rolling in a swell if that helps the word picture.

I'm no engineer either. Seems to me though the increased height of CG would not be much of a problem for a transport aircraft flown very gently vs a fighter were manueverability is so important. The STA doesn't fly far or in inclement weather with the Shuttle on it's back.

SATL382G


User currently offlineCancidas From Poland, joined Jul 2003, 4112 posts, RR: 11
Reply 5, posted (10 years 2 months 1 week 5 days 22 hours ago) and read 2297 times:

very good SATL382G! what i'm thinking of is are the roll and yaw axis affected by the displacement of the cg? see now today i'm not so tired so i cna actually think and form a full, well-thought-out sentence



"...cannot the kingdom of salvation take me home."
User currently offlineSATL382G From , joined Dec 1969, posts, RR:
Reply 6, posted (10 years 2 months 1 week 5 days 22 hours ago) and read 2294 times:

Any change in the CG is going to have an impact on roll, pitch, and yaw axes -- It's a question I think of how much impact.

I thought about the yaw aspect when I was typing the other post.. But that caused my brain to hurt  Smile/happy/getting dizzy so I left it out. Could be the reason for the fins on the horiz. stab, but I thought the fins were augmenting a blanked out vertical stab.

... and, more brain hurt, doesn't this all factor into yaw coupling?

SATL382G


User currently offlineCancidas From Poland, joined Jul 2003, 4112 posts, RR: 11
Reply 7, posted (10 years 2 months 1 week 3 days 1 hour ago) and read 2192 times:

jeez... this is why i'm not in engineering. the more you think about it the more physics it involves. ugh... i just wanna fly!


"...cannot the kingdom of salvation take me home."
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